[BUG] Configure generates invalid Makefile for clang, if AMD runtime is installed

[AngryLoki]

Describe the bug
This issue was originally reported to https://bugs.gentoo.org/919253

When clang is used, and HIP runtime (amdgpu) is installed, build fails with:

>>> Compiling source in /var/tmp/portage/sys-process/lsof-4.99.0/work/lsof-4.99.0 ...

make -j4 DEBUG= all 
Makefile:1120: *** missing separator.  Stop.

$ cat Makefile
... output skipped ...
cc = clang
ccflags = -march=native -O2 -pipe -flto=thin -D_FILE_OFFSET_BITS=64 -DLSOF_VSTR=\"6.5.7-gentoo-dist\"
ccv = 17.0.3
5.7.31921
datadir = /usr/share
... output skipped ...
...

The issue is caused by line https://github.com/lsof-org/lsof/blob/4.99.0/configure.ac#L559 , which attempts to extract clang version, while clang -v additionally outputs version of HIP runtime. This issue is similar to #68, but there it was clang/macos/nvidia and now it affects clang/linux/amdgpu.

$ clang -v 2>&1 | grep version
clang version 17.0.3
Found HIP installation: /usr/local, version 5.7.31921

It is very likely that as described in #68, Makefile will also fail with Found CUDA installation: /usr/local/cuda, version 9.0 too

To Reproduce
Steps to reproduce the behavior:

1. Install hip runtime and clang. Try to build with clang
2. See error

Expected behavior
As clang outputs its version in the first line, and may output arbitrary information after that, it should be safe to take version from the first version in the output.

• Kernel: Linux
• OS: Gentoo
• lsof Version: 4.99.0
• Origin: lsof update during system upgrade

[AngryLoki]

Closed with fix in #306, thanks for merging

[jiegec]

Fixed in #306